Now I'm wondering if I can stack a 6950 using the same process. So far I'm doing 260-265 sols.
after seeing this, i decide to see if my 5850 would run...it does
5 sols/s

amd-catalyst-15.7.1-win10-64bit, optiminer-zcash-0.6.0, hd6770 1gb - 11 sol/s, hd6870 - 19 sol/s
